Hi.
I doubt that what you saw was pus. Pus would only occur at the site of an infection, which would be accompanied by many other symptoms, such as redness, swelling, pain, etc.
What you probably noticed was your own natural lubrication. It seems you need some more basic information about your body and sexuality. I recommend you read the female sexuality section in the Health Information section. Also check out www.scarleteen.com, which has lots of accurate information about sexuality. Obviously, if you ARE experiencing any of the above symptoms, see your gynecologist or go to your local women's clinic or Planned Parenthood for free or low-cost, confidential treatment. Dr. J
You may want to consult your physician and be tested for chlamydia. Whenever you notice something abnormal it is a great idea to get checked before it gets worse.